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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7cb097299f76487a1045a6ce5950c42787dcc7c588003cf131983fd9d3ed522' 
  AND token = 'Y7W+4ze+e9r10tJvzDVNwrHMN8uEsdPkmOQi4dwBpMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}